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The universe is so mind-bogglingly vast that it's inevitable to encounter duplicates, with many stars, planets, or other celestial objects appearing nearly identical at first glance. Yet, there are countless extraordinary anomalies that stand out from their counterparts in thrilling ways.
10. A Scorching Jupiter with Three Suns
Astronomers have discovered numerous “hot Jupiters,” gas giants that orbit extremely close to their stars, but KELT-4Ab stands out. It’s a planet with three suns, residing in a hierarchical triple stellar system.
KELT-4Ab is approximately 1.7 times larger than Jupiter, and its primary star, KELT-A, would appear 40 times larger than our Sun when viewed from its surface. KELT-A has captured two smaller stars, KELT-B and KELT-C, which orbit so far out that it takes 4,000 years for them to complete a single orbit.
Even at this vast distance—328 times farther than Earth is from the Sun—the two distant stars shine with the brightness of a full Moon, though through a telescope, they would be visible only as tiny dots.
9. The Little Asteroid That Could
Most objects in the solar system orbit the Sun in a clockwise direction, following the prograde motion of the vast disk of dust and gas from which they originated.
However, asteroid 2015 BZ509, which shares an orbit with Jupiter, moves in the opposite direction. It is the only known asteroid to do so while orbiting alongside a planet.
It should have been ejected from the solar system long ago, as its retrograde orbit means it encounters Jupiter’s massive gravitational pull twice per orbit. Yet, this tiny asteroid, only 3 kilometers (1.9 miles) across, follows a path that alternates between swinging outside and inside Jupiter's orbit, balancing the gravitational forces and allowing it to remain in a stable orbit for millions of years.
8. A Small Moon with Monumental Features
Pluto's companion, Charon, boasts many surprises for such a small moon. At 1,200 kilometers (750 miles) in diameter—about half the size of Pluto—astronomers expected it to be a cratered, unremarkable world.
However, the New Horizons spacecraft uncovered the red-tinged moon's complex systems of canyons, towering mountains, and signs of landslides. Some regions, though, are surprisingly smooth, hinting that the moon is geologically active with cryovolcanoes, or ice-spouting volcanoes that erase older features with their icy eruptions.
Charon is also marked by a vast 1,600-kilometer-long (1,000 miles) network of fractures that spans its surface, possibly extending across much of its far side. Among these is a canyon that is five times deeper and four times longer than the Grand Canyon in places.
7. A Dying Galaxy That's Far Too Ancient
Stars follow a predictable color pattern: younger, hotter, and larger stars emit a dazzling blue, while older, fading stars turn redder. Once stellar activity ceases, the galaxies that house these stars begin to glow red.
Astronomers have discovered many dead galaxies, but the newly observed ZF-COSMOS-20115 is the oldest known, so ancient that it challenges our understanding of galactic evolution. Surprisingly, it ceased forming stars when the universe was only 1.65 billion years old, a period when galaxies were expected to be bustling with star birth.
Even more puzzling, ZF has three times as many stars as the Milky Way, yet galaxies from the universe's early days shouldn’t be so massive. Even stranger, astronomers believe that it formed all of its stars in just one explosive starburst event that lasted a mere 100 million years.
6. A White Dwarf Pulsar
White dwarfs are the exhausted remnants of stars similar to our Sun, generally considered dead. However, AR Scorpii, a recently discovered white dwarf, stands apart by emitting intense, radioactive beams, resembling a much more powerful pulsar.
AR Scorpii exists within a binary system, paired with a red dwarf roughly a third of the mass of the Sun. Positioned just 1.4 million kilometers away, the two stars complete their swift orbit every 3.6 hours.
In comparison to its companion red dwarf, AR Scorpii is a mass powerhouse. It has the size of Earth but contains 200,000 times more matter. As AR Scorpii spins, it generates a magnetic field 100 million times stronger than Earth's, sending pulsar-like beams across its partner, accelerating electrons in the red dwarf's outer layers to nearly the speed of light, creating a dazzling light show every two minutes.
5. An Earth-Like Planet with a Steam Atmosphere
Located about 39 light-years away, GJ 1132b is a Venus-like planet and the most distant Earth-like planet known to have a confirmed atmosphere.
The 1.6-Earth-mass GJ 1132b orbits closely around a faint red dwarf, which is only a fifth of the Sun's size. It completes an orbit every 1.6 days, and when astronomers observed the planet's orbit in infrared, they noticed a bulge, suggesting a thick, water- and methane-rich atmosphere that blocks out other wavelengths of light.
More significantly, this discovery is a major leap forward in the search for extraterrestrial life. Although GJ 1132b itself is too hot for life as we know it, with a surface temperature of 370 degrees Celsius (698 °F), the ability to identify planets with potentially habitable atmospheres means that future super-telescopes can focus on the most promising candidates for alien life.
4. A Rectangular Galaxy
Gravity shapes galaxies into countless forms, but astronomers have never encountered one quite like LEDA 074886, the 'emerald-cut' galaxy.
This galaxy is unexpectedly boxy, and within its rectangular blur lies an enormous disk of stars. Astronomers have measured the rotation of the stellar disk at 33 kilometers per second (21 mps), but its exact shape remains elusive since it faces Earth edge-on.
Located 70 million light-years from Earth, LEDA shares its cosmic neighborhood with 250 other galaxies, offering a clue to its unusual rectangular form. It could have formed from a merger between two smaller galaxies that once belonged to NGC 1407, the brightest galaxy in the local group and possibly the unintended progenitor of LEDA.
3. A Remarkably Ancient Galaxy
In its early years, the universe was a dense, opaque cloud of hydrogen, blocking certain wavelengths of light and keeping the newborn cosmos hidden from view.
Then came the first stars and galaxies, which ionized the surrounding gas, making it transparent. Recently, astronomers identified one of the ancient galaxies that may have contributed to this, the faintest, smallest ancient galaxy ever discovered: the 13.1-billion-year-old MACS1423-z7p64.
Existing only 700 million years after the Big Bang, MACS1423-z7p64 is much smaller and dimmer than the few other galaxies spotted from this era. It could only be seen due to a rare alignment of 155 galaxies, which created a massive gravitational lens, amplifying the light from MACS1423-z7p64.
2. Stars Created from Chaos
Black holes are known to be destructive forces, but they also give birth to new stars. For the first time, scientists have observed stars forming from the powerful outflows of a supermassive black hole located 600 million light-years away. While we usually associate star formation with calm gas clouds in stellar nurseries, this discovery reveals that stars can also emerge from the violent surroundings of hungry black holes.
This particular black hole resides in a chaotic cosmic region formed by the merging of two galaxies, collectively called IRAS F23128-5919. Black holes are capable of ejecting gas at incredible speeds, often depleting galaxies of their star-forming material. Yet, in this case, the turbulent outflows have created an unexpected environment where extra-hot, extra-bright stars, 30 times the mass of the Sun, are being born.
1. A Collapsing Atmosphere
Atmospheres typically don’t collapse, but Io’s does. As the closest of the Galilean moons to Jupiter, Io faces the full force of the planet’s powerful radiation belts. Despite this, it manages to retain a thin but persistent atmosphere, rich in sulfur dioxide.
Io is essentially one giant volcanic hotspot, with constant eruptions and vents spewing sulfur dioxide. This gas condenses into frost whenever Io enters Jupiter’s shadow. Given that Io completes an orbit around the gas giant every 1.7 Earth days, it spends a brief two-hour period in darkness, with temperatures plummeting to –168 degrees Fahrenheit (–270 °F).
As Io emerges into sunlight, the surface warms up rapidly to an almost mild –148 degrees Celsius (–235 °F), causing the sulfur dioxide ice to sublimate directly into gas form.
